Main nut for hydraulic jacks



FIG. 1 is a front elevational view of a main nut for hydraulic jack showing my new design, the rear view being a mirror image of that shown. The broken lines are for illustrative purposes only and form no part of the claimed design;

FIG. 2 is a top perspective view thereof;

FIG. 3 is a right side elevational view thereof, the left side being a mirror image of that shown.

FIG. 4 is a top plan view thereof; and

FIG. 5 is a bottom perspective view thereof. 

The ornamental design for a main nut for hydraulic jacks, as shown and described. 